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<html>
	<head>
		<meta charset="utf-8">
		<title>类选择器最实用</title>
		<style>
			.c3{
				color: green;
			}
			.c1{
				color: red;
				/* font-size:100px; */
			}
			.c2{
				color: aqua;
			}
			
		</style>
	</head>
	<body>
		<div class="c1 c2 c3">
			疫情3年，终于快结束了
		</div>
	</body>
</html>